SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION
SUPPLY AIR
TEMPERATURE
SENSOR
Fig. 27 — Supply Air Sensor Location
Table 3 — Supply Air Sensor
Temperature/Resistance Values
TEMPERATURE (F) | RESISTANCE (ohms) |
200,250 | |
100,680 | |
53,010 | |
29,091 | |
14 | 16,590 |
32 | 9,795 |
50 | 5,970 |
68 | 3,747 |
77 | 3,000 |
86 | 2,416 |
104 | 1,597 |
122 | 1,080 |
140 | 746 |
158 | 525 |
176 | 376 |
185 | 321 |
194 | 274 |
212 | 203 |
230 | 153 |
248 | 116 |
257 | 102 |
266 | 89 |
284 | 70 |
302 | 55 |
The temperature sensor looks like an eyelet terminal with wires running to it. The sensor is located in the “crimp end” and is sealed from moisture.
Outdoor Air Lockout Sensor
The EconoMi$er IV is equipped with an ambient tempera- ture lockout switch located in the outdoor air stream which is used to lockout the compressors below a 42 F ambient tem- perature. See Fig. 17.
E. EconoMi$er IV Control Modes
Determine the EconoMi$er IV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 4. The EconoMi$er IV is supplied from the factory with a supply air temperature sensor and an outdoor air temperature sensor. This allows for operation of the EconoMi$er IV with outdoor air dry bulb changeover control. Additional accessories can be added to allow for different
types of changeover control and operation of the EconoMi$er IV and unit.
Outdoor Dry Bulb Changeover
The standard controller is shipped from the factory config- ured for outdoor dry bulb changeover control. The outdoor air and supply air temperature sensors are included as standard. For this control mode, the outdoor temperature is compared to an adjustable set point selected on the control. If the
Table 4 — EconoMi$er IV Sensor Usage
| ECONOMI$ER IV WITH OUTDOOR AIR | |||||
APPLICATION |
| DRY BULB SENSOR | ||||
|
| Accessories Required | ||||
Outdoor Air | None. The outdoor air dry bulb sensor | |||||
Dry Bulb |
| is factory installed. | ||||
Differential |
| CRTEMPSN002A00* | ||||
Dry Bulb |
| |||||
|
|
|
|
|
| |
Single Enthalpy |
|
| HH57AC078 | |||
Differential |
|
| HH57AC078 | |||
|
|
|
| and | ||
Enthalpy |
|
|
|
| ||
| CRENTDIF004A00* | |||||
|
| |||||
CO2 for DCV |
|
|
|
|
|
|
Control using a |
|
| 33ZCSENCO2 | |||
|
| |||||
|
|
|
|
|
| |
CO2 Sensor |
|
|
|
|
|
|
CO2 for DCV | 33ZCSENCO2† |
|
|
|
| |
Control using a |
| OR |
| CRCBDIOX005A00†† | ||
and |
|
|
| |||
|
|
| ||||
33ZCASPCO2** |
|
|
|
| ||
CO2 Sensor |
|
|
|
| ||
|
|
|
|
|
|
*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that will not be needed for installation.
†33ZCSENCO2 is an accessory CO2 sensor.
**33ZCASPCO2 is an accessory aspirator box required for
††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2 and 33ZCASPCO2 accessories.